Re: [PATCH 2/5] powerpc: Allow 4096 bytes of stack expansion for the signal frame

Daniel Axtens writes: > Hi Michael, > > Unfortunately, this patch doesn't completely solve the problem. > > Trying the original reproducer, I'm still able to trigger the crash even > with this patch, although not 100% of the time. (If I turn ASLR off > outside of tmux it reliably crashes, if I tur

Re: [PATCH 2/5] powerpc: Allow 4096 bytes of stack expansion for the signal frame

Hi Michael, Unfortunately, this patch doesn't completely solve the problem. Trying the original reproducer, I'm still able to trigger the crash even with this patch, although not 100% of the time. (If I turn ASLR off outside of tmux it reliably crashes, if I turn ASLR off _inside_ of tmux it reli

[PATCH 2/5] powerpc: Allow 4096 bytes of stack expansion for the signal frame

We have powerpc specific logic in our page fault handling to decide if an access to an unmapped address below the stack pointer should expand the stack VMA. The code was originally added in 2004 "ported from 2.4". The rough logic is that the stack is allowed to grow to 1MB with no extra checking.